Working on a Monroe OC8820

November 20, 2024, 1:09pm 101

Hi, good morning everyone!

That is an amazing finding! Congratulations! I started to work on recreating the RAM for my Monroe MCA200 (aka Monroe OC8820). I’m not in a position to replace almost all of the 4116 chips (they’re too expensive here), so I’m testing and looking for alternatives.

I remember you mentioned a while back that you might have a chance to get the Monroe service manual, do you have any updates on that?

No sorry, but the guy that had it can find it, Sorry for that

Do you really need to replace all?

Yes, almost all were damaged. I have 16KB that survived on the video card, the other 4116 were cracked (one of them exploded).

Now the computer shows the message “testing” and then “call for service” but that’s ok. I assume there are no other damaged parts, but until I get the memory banks working I won’t be able to tell if I need to repair anything else.

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Hi all

Added some more files into my git

took some help from AI to finishing my disassembling for the boot rom.

Quite intresting especially the hdd boot, you find it here

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Sweproj

August 14, 2026, 8:59am 107

Long time since updating here.

Been working on a hdd support,by emu, for monroe for a while but just some time ago i was able to but an hdd as well, MA 8615 so the work can maybe continue

I have also made a webbased tool to extract floppy/hdd image into plain files

There is also files in my disc image archive

and a command line tool to both read and write floppy images

I some body else have other disc image please share

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